Rare Mk14 Anti-Structure Grenades & Scalable Offensive Hand Grenade In Ukraine

One of the rarer hand grenades to surface in Ukraine is the US Mk14 Anti-Structure grenade. These were developed by the Naval Surface Warfare Center’s Indian Head Explosive Ordnance Disposal Technology Division, back in the 2000s.

The Mk 14 Mod 0 Anti-Structural Munition Hand Grenade has been primarily used by USSOCOM. It is reportedly a Thermobaric Fuel-Air-Explosive Blast (FAE-Blast), hand grenade with a longer duration HE-Blast pressure curve.

The ASM has a thin-walled aluminium body with a main charge filler of PBXN-109 and a PBXN-114 booster. The grenade body is black with three knurled bands with a yellow band at the top and two sticker labels which read: “HE Overpressure Grenade, NEW 0.88 lbs. Fuze 4.5 sec”.

Using the principle of overpressure the ASM, much like the US Army’s new M111 grenade, reduces the risk of friendly casualties due to fragmentation during close combat. In enclosed areas the grenade creates concussion effects and can be used for for blast or demolition tasks. It has a M213-type fuze with a 3-5 second delay, though the stickers seen on the grenades state 4.5 seconds

The available evidence of Mk14 ASM presence in Ukraine is extremely slim. To date, I have only come across a handful of images of the grenades, which were reportedly taken in Ukraine. The individuals who have shared imagery of the grenades have predominantly been associated with Ukrainian special operations units.

Another extremely rare offensive hand grenade seen in Ukraine is the Nammo Scalable Offensive Hand Grenade (SOHG – HGO115M-3.5). The SOHG is a modular grenade with a plastic body packed with either Comp B filling (115g) or PBXN-11 filling (130g). It has a male-female screw interface moulded into the body that allows up to three modules (which can all be used individually) to be screwed together. This allows the system to be scaled to the target its engaging or the space its being used in – Nammo say one equals a concussion grenade, two creates enough overpressure to kill anyone in a average space and the cumulative effect of three modules provides a small scale anti-structure capability. According to Nammo the SOHG modules with a fuze weigh 230g while the modules without fuze weight 190g.

Designated the MK21 Mod 0 in US service, SOCOM have been using them since 2010 and the US Marine Corps purchased some in 2024. Unlike the Mk 14 Mod 0 it is not a thermobaric grenade. The first sighting of them in Ukraine came in July 2024, when a Russian telegram channel posted a short video showing some of the weapons captured from Ukrainian units by a reconnaissance unit with Russia’s Tsentr (Center) battlegroup.

In November 2024, when a Russian telegram channel focused on Sapper and EOD activities shared photos of a base unit and an additional module. It’s unclear if these are captured examples or they are images pulled from the internet to illustrate the post.

Most recently, in May 2025, a pair of SOHGs were captured by Russian forces, each was captured with its own fuze, configured for individual use. All of the grenades seen in the imagery have the lot number VR123L001-002 and an NSN which denotes they are filled with Composition B. The grenades have likely been provided directly by Norway.

Thanks to AbraxasSpa and Helvegen29 for thier help collecting imagery.

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